linux-kernel - [PATCH] jffs2: fix a memory leak bug

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Date:   Mon, 19 Aug 2019 16:55:04 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org (open list:JOURNALLING FLASH FILE SYSTEM
        V2 (JFFS2)), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] jffs2: fix a memory leak bug

In jffs2_scan_eraseblock(), 'sumptr' is allocated through kmalloc() if
'sumlen' is larger than 'buf_size'. However, it is not deallocated in the
following execution if jffs2_fill_scan_buf() fails, leading to a memory
leak bug. To fix this issue, free 'sumptr' before returning the error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 fs/jffs2/scan.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 90431dd..5f7e284 100644
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -527,8 +527,11 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 					err = jffs2_fill_scan_buf(c, sumptr, 
 								  jeb->offset + c->sector_size - sumlen,
 								  sumlen - buf_len);				
-					if (err)
+					if (err) {
+						if (sumlen > buf_size)
+							kfree(sumptr);
 						return err;
+					}
 				}
 			}
 
-- 
2.7.4